If you’re feeling any soreness in your quads it can be due to several issues:

• It is often due to bending at the waist when you’re running. (see pages 161 & 162 in the book) This will put undue stress onto your quads because they have to “catch” you with each foot strike. When you bend at the waist your feet naturally swing out in front of your body which then creates a heel strike, which is always a direct cause of tired quads. The best thing you can do for your quads is to always run with your center of gravity in front of where your feet are touching the ground so that your stride opens up behind you as soon as your foot hits the ground. If your foot lands anywhere in front of your body, you’re “braking” with each step and you’ll feel it in your quads.
• You might also have too long of a stride which will cause the same result. Running with a shorter stride allows you to keep your foot strike under your body instead of in front of it.
• You are also probably not rotating your pelvis with each stride. (see pages 179 & 180 in the book) Allowing your pelvis to rotate as you run is a great way to cushion the shock to your quads because much of the impact of your foot strike is taken by your pelvis, not by your quads.

Cheers - Danny